Paranoid Penguin - Linux VPNs with OpenVPN, Part II

Build a simple, secure VPN connection now!
Conclusion

At this point, I've got good news and bad news. The good news is, you've made it through the most complicated part of OpenVPN configuration: creating a PKI and generating certificates and related files. The bad news is, you've also reached the end of this month's column!

If you can't wait until next time to use these certificates, to get OpenVPN running, you probably can figure out how to do so yourself. See the openvpn(8) man page and the sample configuration files server.conf.gz and client.conf under /usr/share/doc/openvpn/examples/sample-config-files, upon which my examples are based. Good luck!

Mick Bauer (darth.elmo@wiremonkeys.org) is Network Security Architect for one of the US's largest banks. He is the author of the O'Reilly book Linux Server Security, 2nd edition (formerly called Building Secure Servers With Linux), an occasional presenter at information security conferences and composer of the “Network Engineering Polka”.

______________________

Comments

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

password authentication

Anonymous777's picture

I wonder about security if I use a certificate on the server and username/password authentication as the only form of client authentication. As far as I understand this still should be much better than PSK because still authentication is done and changing session keys are used afterwards.
But of course a secure password should be chosen (16-32 random chars).

Or do I miss something here?

Duplicated step

Anonymous's picture

Near the end of page 2 you say "You've got two more files to generate..."

openssl dhparam -out keys/dh1024.pem 1024

but the keys/dh1024.pem file has already been generated by the "./build-dh" command (at least on my system - Ubuntu 9.04).

Minor typo?

Anonymous's picture
openvpn --genkey --secret 2.0/keys/ta.key

... should be ...

openvpn --genkey --secret keys/ta.key

since we're working in the "2.0" directory.

Thanks for the great series!

-Tyler

Webinar
One Click, Universal Protection: Implementing Centralized Security Policies on Linux Systems

As Linux continues to play an ever increasing role in corporate data centers and institutions, ensuring the integrity and protection of these systems must be a priority. With 60% of the world's websites and an increasing share of organization's mission-critical workloads running on Linux, failing to stop malware and other advanced threats on Linux can increasingly impact an organization's reputation and bottom line.

Learn More

Sponsored by Bit9

Webinar
Linux Backup and Recovery Webinar

Most companies incorporate backup procedures for critical data, which can be restored quickly if a loss occurs. However, fewer companies are prepared for catastrophic system failures, in which they lose all data, the entire operating system, applications, settings, patches and more, reducing their system(s) to “bare metal.” After all, before data can be restored to a system, there must be a system to restore it to.

In this one hour webinar, learn how to enhance your existing backup strategies for better disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible bare-metal recovery solution for UNIX and Linux systems.

Learn More

Sponsored by Storix